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May be late but an answer, for anyone else that end up here.

The value is in microseconds and the year y shifted -369 years.

Your original value -> 13258124587568466
-> 2390-02-18 12:23:07.568466
-> 2021-02-18 12:23:07.568466 <- ¿your actual datetime?

    timestamp_microseconds = 13383785473626492
    timestamp_seconds = timestamp_microseconds / 1_000_000
    var date = new Date(0);
    date.setUTCSeconds(timestamp_seconds);
    console.log(date.toString());

    // 369 - yr gap 
    date_delta_years = 369
    date.setFullYear(date.getFullYear()-date_delta_years)
    console.log(date.toString());

    // 2394-02-11 22:11:13.626492
    // 2025-02-11 22:11:13.626492 <- When I created the cookie log to check.

    // Your original value -> 13258124587568466
    // 2390-02-18 12:23:07.568466
    // 2021-02-18 12:23:07.568466 <- Probably your actual datetime.

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